N-甲基-N-(2-甲基丙烯酰氧乙基)苯胺敏化的丙烯腈光聚合

The photopolymerization of acrylonitrile sensitized by N-methyl-N-(2-methacryloyloxye-thyl)aniline (MEMA) was studied kinetically. The photopolymerization rate of AN in DMF by using MEMA as sensitizer is proportional to 0.32 th power of MEMA concentration and 1.20 th power of AN concentration. The overall activation energy for the polymerization was found to be 4.82 Kcal/Mol. From the fluorescence analysis of obtained polyacrylonitrile sensitized by MEMA, it was confirmed that MEMA not only joined the inition but also entered into the polyacrylonitrile chains. The initiation mechanism was proposed tentatively.     

含胺基功能性单体的聚合研究——ⅩⅤ.含吗啉基丙烯酸酯类所构成的氧化还原引发体系及其水凝胶

本文研究了含吗啉基的丙烯酸酯类,甲基丙烯酸-2-吗啉基乙酯(MPEMA)和甲基丙烯酸-2-N-吗啉基异丙酯(MPIPMA)与过硫酸盐构成的引发体系引发丙烯酰胺的聚合。它们不仅参与氧化还原引发反应,还参与丙烯酰胺的聚合物链中,以此引发体系可以获得粘均分子量在10~7以上的聚丙烯酰胺。这些单体的水溶液在过硫酸盐作用下,很易在室温下聚合,对其轻度交联聚合物的吸水能力,及对热的行为进行了研究。     

N-甲基丙烯酰-N′-嘧啶基哌嗪及其聚合物的荧光光谱研究

A novel acrylic monomer bearing pyrimidino-moiety, N-methacrylyl-N'-pyrimidinopipe-razine (MPMP) was synthesized by the reaction of N-pyrimidinopiperazine and methacrylyl chloride in the presence of triethylamine. Both absorption and fluorescence spectum for the monomer and its polymer were recorded. It was observed that the fluorescence intensity of monomeric MPMP was slightly lower than that of its polymer. The monomer did not dramatically appear its structural self-quenching effect as we have reported previously. The fluores-cence of the polymer,P(MPMP) culd be quenched by electron-deficient quenchers such as methacrylonitrile,acrylonitrile,fumaronitrile; methyl acrylate and methyl methacrylate. The Stern-Volmer constants of those quenchers for P(MPMP) were determined.     

含生色基团烯类单体及其聚合物——N－丙烯酰基吩■嗪及其聚合物的合成和其荧光性质

含生色基团烯类单体及其聚合物——Ｎ－丙烯酰基吩嗪及其聚合物的合成和其荧光性质＊于淑艳姚光庆李福绵（北京大学化学系北京１００８７１）关键词Ｎ－丙烯酰基吩嗪,紫外－可见光谱,荧光光谱,“结构自猝灭”效应,Ｓｔｅｒｎ－Ｖｏｌｍｅｒ常数,荧光寿命我们曾报...     

聚乙烯醇衍生的聚离子复合物的研究——聚离子复合物的制备及其溶解性能

从乙醛酸、醛基苯甲酸、醛基苯磺酸、醛基吡啶、二甲氨基苯甲醛等醛基化合物,通过缩醛化反应,在聚乙烯醇上引进了阳离子及阴离子基团,制备了相应的聚乙烯醇型聚离子复合物,研究了它们的溶解性,找到了较好的溶剂体系H_2O-DMF-NaSCN。     

甲基丙烯酸异丁酯与甲基丙烯酸-β-羟基酯的乳液共聚合及其应用于显像管的成膜材料

探讨了甲基丙烯酸异丁酯与亲水性甲基丙烯酸酯类的乳液共聚合,所得乳液颗粒很细(0.1μ以下),并具有非常好的放置稳定性,至少10个月未见有明显的凝聚现象。适用于彩色显像管荧光屏的临时涂膜材料。 测定了 PHEMA、PHPMA 及P(IBMA-HPMA)、P(IBMA—HEMA)的热失重曲线。表明,均属于典型的热解聚型高聚物。HPMA、HEMA的含量在20％以下的共聚物适用于有机载膜材料。     

N-丙烯酰-2-氯吩噻嗪、N-丙烯酰-2-乙酰基吩噻嗪单体和聚合物的合成以及荧光行为的研究

含芳杂环的丙烯酰类功能性单体及其聚合物的合成一直吸引人们的兴趣,原因之一是由于这类单体可用一般的自由基引发剂引发聚合,这类聚合物所表现出的光化学、电化学性质甚被瞩目。如含吩噻嗪的丙烯酰类衍生物可以和缺电子的化合物形成电荷转移     

N-丙烯酰-2-氯吩噻嗪、N-丙烯酰-2-乙酰基吩噻嗪单体和聚合物的合成以及荧光行为的研究

Two N-acrylic monomers having phenothiazine moieties , N-acrylyl-2-chlorophe-nothiazine ( I ) , N-acrylyl-2-acetylphenothiazine ( I ) were synthesized and their polymers were obtained by free radical polymerization . The fluorescence study showed that at the same molar concentration of the chromophores, the fluorescence intensities of the polymers were much stronger than that of the monomers. This would be explained by what we called "Structural Self-quenching Effect. " The Stern-Volmer constants of the polmers quenched by several electron defecient vinyl monomers were obtained. The results indicated that their quenching efficiencies were relevant to the degree of the electron deficiency of the double bond.     

N-甲基丙烯酰-N′-嘧啶基哌嗪及其聚合物敏化的丙烯腈光聚合

我们曾报道过同一分子中含有给电子生色基团和电子受体基团的一类功能性单体,如甲基丙烯酸-4-N,N-二甲氨基苄酯(DMABMA),N-(4-N′,N′-二甲氨基苯基代丙烯酰胺,N-(4-N′、N′)-二甲氨基苯基代甲基丙烯酰胺(DMAPMA),8-丙烯酰氧喹啉(AQ),N-丙烯酰-N′-苯基哌嗪(APP)的合成、聚合以及单独或与过氧化二酰构成氧化还原体系以引发烯类单体的聚合研究。N-甲基丙烯酰-N′-嘧啶基哌嗪(MPMP)     

聚乙烯醇衍生的聚离子复合物的研究 Ⅳ．乙烯－乙烯醇共聚物衍生的聚离子复合物的电荷性质与抗凝血性

分别将３－磺酸丙基、磷酸基和４—Ｎ一苯基三甲基碘化铵基引进乙烯－乙烯醇共聚物（ＥＶＡ）链中制得了聚阳离子和聚阴离子，然后得到相应的聚离子复合物．当ＥＶＡ分子链中的羟基的取代度在６０％以上时，所制得的中性聚离子复合物的血浆凝固时间和空白玻璃的血浆凝固时间之比可在８～１３之间，而负电性聚离子复合物可高达１１０左右．这些聚离子复合物膜对小分子电解质或小分子中性物质如氯化钠、尿素、葡萄糖等表观渗透系数皆在１０－７ｃｍ２＼ｓ以上．